Battery Cell Pressing Jig With Auxiliary Pad for Uniform Pressure
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing charging and discharging jig devices for secondary batteries apply uneven pressure to battery cells due to the thickness difference between the body area and the sliding area, leading to pressure gaps and non-uniform pressure distribution.
Innovation Solution
A charging and discharging jig device with a pair of pressing jigs and an auxiliary pressing member that covers the sliding area, providing a step on the pressing surface to ensure uniform pressure application, using materials like silicon for the pressing pads and stainless-steel for the jigs, with the auxiliary pressing member made of a harder material to cover 40% to 100% of the sliding area's width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flat pressing surface is used to apply pressure to the battery cell, then the structure is simple, but the pressure distribution becomes non-uniform due to thickness difference between body area and sliding area
Solution Approach 1:
The pressing surface is divided into two distinct regions: a first pressing surface for the body area and a second pressing surface for the sliding area. These surfaces have different characteristics (flat vs. inclined) to match the local thickness requirements of different battery cell regions, achieving uniform pressure distribution through localized structural differentiation.
Solution Approach 2:
The second pressing surface introduces an inclined plane geometry instead of a flat surface. This dimensional change in the pressing surface configuration allows the pressing member to maintain contact with the thinner sliding area portion while the first pressing surface contacts the thicker body area, compensating for thickness variations.
2Stability of the object's composition
If pressure is applied to limit volume change during charging and discharging, then the battery cell stability is improved, but the sliding area with smaller thickness experiences excessive pressure and potential damage
Solution Approach 1:
Different pressing surfaces are applied to different regions of the battery cell: the first pressing surface (flat) contacts the thicker body area requiring stronger pressure for volume control, while the second pressing surface (inclined) contacts the thinner sliding area requiring reduced pressure to avoid damage. This localized differentiation resolves the contradiction between volume stability and sliding area protection.
Solution Approach 2:
The inclined second pressing surface provides partial pressure application to the sliding area, sufficient for stability but reduced compared to what a flat surface would apply. This partial action prevents excessive pressure on the vulnerable sliding area while still maintaining overall cell stability.
3Stability of the object's composition
If the pressing member contacts the sliding area directly, then pressure can be applied to maintain stability, but the pressure distribution becomes non-uniform causing potential damage
Solution Approach 1:
The pressing member incorporates two distinct pressing surfaces with different geometries: a flat first pressing surface for the body area and an inclined second pressing surface for the sliding area. This local quality differentiation ensures that each region receives appropriate pressure characteristics, maintaining both stability and reliability.
Solution Approach 2:
The inclined second pressing surface acts as an intermediary between the pressing member and the sliding area. It distributes the applied pressure more evenly across the sliding area's contact surface, preventing concentration of stress that would compromise cell integrity while still providing the necessary stabilizing pressure.
Data Source
AI summary
A charging and discharging jig device includes a pair of pressing jigs, and an auxiliary pressing member provided between opposing surfaces of the pair of pressing jigs. The auxiliary pressing member is configured to compress a sliding area of a battery cell when the battery cell is disposed between the pair of press jigs.